
Add `LLVM_BUILD_TELEMETRY` to the list of flags exposed in `LLVMConfig.cmake`. This fixes telemetry library being misdetected as `OFF` when building LLDB standalone. Fixes bac62ee5b473e70981a6bd9759ec316315fca07d. ------ I guess this also needs a backport to 20.x. (cherry picked from commit 2ad9d5f5f01cd4f29788a0cf7b21790df13fca71)
See docs/CMake.html for instructions on how to build LLVM with CMake.